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3 years ago

Adding and subtracting positive and negative numbers

Mathematics

2 answers:

algol133 years ago

5 0

Answer:

Step-by-step explanation:

Rule Example

+(+) Two like signs become a positive sign 3+(+2) = 3 + 2 = 5

−(−) 6−(−3) = 6 + 3 = 9

+(−) Two unlike signs become a negative sign 7+(−2) = 7 − 2 = 5

−(+) 8−(+2) = 8 − 2 = 6

inna [77]3 years ago

3 0

When you add two positives it’s a positive
When you add a positive and negative it’s either depending on each number
When you add two negatives the answer will be negative -3+(-4)=-7

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Distributive property to write an equivalent expression 9(9m+3t)

Klio2033 [76]

Answer:

Step-by-step explanation:

9(9m+3t) = 9 *9m + 9*3t

= 81m + 27t

7 0

4 years ago

Many doctors rely on the use of intravenous medication administration in order to achieve an immediate response of a particular

rewona [7]

The domain of the function is 0 ≤ t ≤ 3 and the greatest concentration of the medication is 2mg/L

<h3>The domain of the function</h3>

The equation of the function is given as:

$C(t) = \frac{-18t^2 + 54t}{t^2 + 7t + 10}$

Time can be 0 or greater but cannot be negative.

So, the domain of the function includes t ≥ 0

Set the function to 0 to determine the maximum value of t.

$\frac{-18t^2 + 54t}{t^2 + 7t + 10} = 0$

Cross multiply

$-18t^2 + 54t = 0$

Factor out -18t

-18t(t - 3) = 0

Divide both sides by -18t

t - 3 = 0

Add 3 to both sides

t = 3

This means that the maximum value of t is 3

Hence, the domain of the function is 0 ≤ t ≤ 3

<h3>The greatest concentration of the medication</h3>

From the graph of the function (see attachment), we have the maximum value to be;

C(t) = 2

Hence, the greatest concentration of the medication is 2mg/L

Read more about functions at:

brainly.com/question/1214333

#SPJ1

8 0

2 years ago

What is the solution to this equation ?<br><br><br> x + 9 = -4

PolarNik [594]

Isolate the x. Note the equal sign. What you do to one side, you do to the other.

Subtract 9 from both sides

x + 9 (-9) = -4 (-9)

x = -4 - 9

x = -13

-13 is your solution

hope this helps

8 0

4 years ago

Select the correct answer from each drop-down menu.

romanna [79]

Answer:

Area of ΔXYZ = n(r * r) square units

Step-by-step explanation:

Sides of ΔABC are 30 units, 40 units and 60 units.

Corresponding sides of another triangle XYZ are r times as long as the sides of ΔABC.

Therefore, sides of ΔXYZ will be, 30r units, 40r units and 60r units.

Perimeter of the triangle XYZ = 30r + 40r + 60r

= 130r units

If the area of ΔABC = n square units

Then the ratio of the area of ΔXYZ and ΔABC = (Ratio of the sides of ΔXYZ and ΔABC)²

$\frac{\text{Area of triangle XYZ}}{\text{Area of triangle ABC}}=(\frac{\text{Side length of XYZ}}{\text{Side length of triangle ABC}})^2$

$\frac{\text{Area of triangle XYZ}}{n}=(r)^2$

Area of ΔXYZ = nr² ≈ n(r * r)

Therefore, Option (3) will be the answer.

5 0

3 years ago

What fraction is less than 1/2. 3/4,1/6,6/12,4/10,5/8,5/2

vazorg [7]

1/6! Any fraction that represents less than a half of a whole is less than 1/2. You could also convert them to the same denominator and see the difference. Make sure whatever you do to the first fraction, you do to the other!

6 0

3 years ago

Read 2 more answers